Crystal structure and magnetic properties of dicarboxylate-bridged linear chain Mn(II) complexes

Kim, Jinkwon; Lim, Jin Mook; Suh, Man Cheol; Yun, Hoseop

doi:10.1016/s0277-5387(01)00791-4

Cited by 20 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The value of χ m T at room temperature is 4.14 cm 3 ·K·mol –1 , which is close to the expected value for an isolated Mn(II) ion S = 5/2 assuming g = 2.0 (4.37 cm 3 ·K·mol –1 ). The χ m T value drastically drops below 100 K and decreases to 0.322 cm 3 ·K·mol –1 at 2.0 K. The susceptibility (χ m ) increases with the temperature cooling, reaching the value of 0.181 cm 3 ·mol –1 at 6.45 K, and quickly decreases until 2.0 K. Compound 2 is a carboxylate bridged 1-D structure if the long-range coupling along the bpe bridge is ignored and TTF radical concentration cannot be detected; therefore, Fisher’s uniform 1-D model was used to fit the susceptibility data . The best fit for the experiment data of 2 is given by the following parameters: J = −1.14 cm –1 and g = 1.98A.…”

Section: Resultsmentioning

confidence: 99%

Ligand-to-Ligand Charge Transfer within Metal–Organic Frameworks Based on Manganese Coordination Polymers with Tetrathiafulvalene-Bicarboxylate and Bipyridine Ligands

et al. 2016

View full text Add to dashboard Cite

A systematic study on ligand-to-ligand charge-transfer (LLCT) properties of three closely related metal-organic frameworks (MOFs) is presented. These compounds are formulated as [MnL(4,4'-bpy)(H2O)]n·nCH3CN (1), [MnL(bpe)0.5(DMF)]n·2nH2O (2), and [MnL(bpa)(H2O)]n·2nH2O (3) (L = dimethylthio-tetrathiafulvalene-bicarboxylate, 4,4'-bpy = 4,4'-bipyridine, bpe = 1,2-bis(4-pyridyl)ethene, bpa = 1,2-bis(4-pyridyl)ethane). The X-ray single-crystal diffractions show that complexes 1-3 are all two-dimensional (2-D) coordination polymers with different frameworks in crystal lattices. Charge-transfer (CT) interactions within these MOFs are visually apparent in colors and vary according to the conjugated states of the bipyridine ligands (4,4'-bpy, bpe, and bpa). Theoretical calculations show that the charge transfer occurs from ligand L to bipyridine. The intensity of the LLCT is in the order of 2 > 1 > 3 investigated by theoretical calculations and ESR, which indicates that the intensity of CT is related to the bipyridyl conjugated state. Photocurrent responses of these compounds are consequently studied, and the results are in agreement with the intensity of charge transfer and linearly related to the LLCT energy.

show abstract

Section: Resultsmentioning

confidence: 99%

Ligand-to-Ligand Charge Transfer within Metal–Organic Frameworks Based on Manganese Coordination Polymers with Tetrathiafulvalene-Bicarboxylate and Bipyridine Ligands

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The intrachain exchange interaction of Mn II -Mn II might be quite weak, considering that the coupling constant has been estimated as only Ϫ0.20 cm Ϫ1 in a linear chain Mn II complex bridged by a carboxylate ligand with a syn-anti bonding mode. [19] Furthermore, hydrogenbond-mediated magnetic interactions between manganese ions are also weak. [20] Thus, based on these facts, the expected χ m T value of 1 can be modeled with Equation ( 4).…”

Section: Resultsmentioning

confidence: 99%

“…Equation (3 ) represents the theoretical model for an [Mn(H 2 O) 4 ] 2+ site. The intrachain exchange interaction of Mn II ‐Mn II might be quite weak, considering that the coupling constant has been estimated as only −0.20 cm −1 in a linear chain Mn II complex bridged by a carboxylate ligand with a syn ‐ anti bonding mode 19. Furthermore, hydrogen‐bond‐mediated magnetic interactions between manganese ions are also weak 20.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A Novel One‐Dimensional Chain Complex Composed of Oxo‐Centered Trinuclear Manganese Clusters

Kim

Lim²,

Do³

2003

Eur J Inorg Chem

Self Cite

View full text Add to dashboard Cite

A new linear chain complex of oxo‐centered trinuclear manganese clusters, [{MnIII2MnIIO(O2CCHCl2)6(H2O)}{Mn(O2CCHCl2)2(H2O)4}]n (1), has been synthesized by treatment of a mixture of Mn(OAc)2·4H2O and dichloroacetic acid in dichloromethane with KMnO4. In this complex chains are formed by hydrogen bonding between carboxylate oxygens and coordinated water molecules, forming a two‐dimensional structure. Antiferromagnetic coupling was observed by variable‐temperature magnetic measurements. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

show abstract

“…40 The analysis of the magnetic data shows antiferromagnetic interactions. For Cu(II) derivative, a polynomial expression derived by Bonner and Fisher 39,41 for a uniform chain of spin S = 1/2 gives J = −93.37 cm −1 , g = 2.09 while the Mn(II) derivative has been analysed with the Fisher's equation 36,42 for a uniform chain of spin S = 5/2 and giving J = −1.038 cm −1 and g = 1.98. When the 2,2′-bipyridine is replaced by the 4,4′-bipyridine (4,4′-bpy), a 2D structure of the formula [Mn(BMT-TTF-bis-CO 2 )(4,4′-bpy)(H 2 O)] n was obtained (Fig.…”

Section: Perspectivementioning

confidence: 99%

Paramagnetic 3d coordination complexes involving redox-active tetrathiafulvalene derivatives: an efficient approach to elaborate multi-properties materials

et al. 2013

View full text Add to dashboard Cite

The elaboration of multifunctional materials is a great challenge for the physical chemistry community and the studies of molecular materials exhibiting coexistence or synergy between two or more properties are very active. In particular, molecular compounds displaying electrical conductivity and magnetic interactions are currently the subject of intensive studies. Two approaches are now well-known and are explored. On the one hand, the interactions between mobile electrons of the organic network (π electrons) and localized electrons of paramagnetic transition metal (d electrons) take place through space. On the other hand, these interactions take place through covalent chemical bonds. In the latter, the probability to have significant interaction between π and d electrons is enhanced compared to the first approach. In this perspective article, we will give an overview of the known coordination complexes involving tetrathiafulvalene derivatives as ligands for paramagnetic 3d ions and we will describe their physical properties. If necessary, the coexistence or synergy between electrical conductivity, magnetism and other properties will be highlighted.

show abstract

Crystal structure and magnetic properties of dicarboxylate-bridged linear chain Mn(II) complexes

Cited by 20 publications

References 16 publications

Ligand-to-Ligand Charge Transfer within Metal–Organic Frameworks Based on Manganese Coordination Polymers with Tetrathiafulvalene-Bicarboxylate and Bipyridine Ligands

Ligand-to-Ligand Charge Transfer within Metal–Organic Frameworks Based on Manganese Coordination Polymers with Tetrathiafulvalene-Bicarboxylate and Bipyridine Ligands

A Novel One‐Dimensional Chain Complex Composed of Oxo‐Centered Trinuclear Manganese Clusters

Paramagnetic 3d coordination complexes involving redox-active tetrathiafulvalene derivatives: an efficient approach to elaborate multi-properties materials

Contact Info

Product

Resources

About